CN118086619A - Nitrogen-containing steel and smelting method thereof - Google Patents
Nitrogen-containing steel and smelting method thereof Download PDFInfo
- Publication number
- CN118086619A CN118086619A CN202410243064.8A CN202410243064A CN118086619A CN 118086619 A CN118086619 A CN 118086619A CN 202410243064 A CN202410243064 A CN 202410243064A CN 118086619 A CN118086619 A CN 118086619A
- Authority
- CN
- China
- Prior art keywords
- nitrogen
- oxygen
- smelting
- molten iron
- containing steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003723 Smelting Methods 0.000 title claims abstract description 39
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 116
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 82
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000001301 oxygen Substances 0.000 claims abstract description 71
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 71
- 229910052742 iron Inorganic materials 0.000 claims abstract description 58
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- 238000007664 blowing Methods 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 25
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000011261 inert gas Substances 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses nitrogen-containing steel and a smelting method thereof, and belongs to the technical field of nitrogen-containing steel smelting. The preparation method of the nitrogen-containing steel comprises the following steps: performing KR working procedure on the molten iron raw material, adding silicon manganese nitride, stirring, then performing converter smelting with converter slag, top blowing oxygen, bottom blowing inert gas, and top blowing nitrogen after stopping oxygen blowing; the end point of converter smelting is to obtain the converter molten steel with oxygen content of 0.07-0.10wt%, carbon content less than or equal to 0.06wt%, nitrogen content of 0.008-0.0100wt%, temperature of 1620-1640 ℃, and LF refining and continuous casting to obtain the nitrogen-containing steel. According to the invention, the powdery silicon manganese nitride is added in the KR procedure, the molten iron ratio of the converter is reduced, the nitrogen is blown after blowing is stopped, so that the nitrogen increase is realized, and the addition amount of the silicon manganese nitride can be effectively reduced.
Description
Technical Field
The invention belongs to the technical field of nitrogen-containing steel smelting, and particularly relates to nitrogen-containing steel and a smelting method thereof.
Background
The converter smelting is a necessary step in steel smelting, and the converter smelting process is mainly a decarburization process. In the prior art, nitrogen is blown into the bottom of the converter in the converter smelting period, the nitrogen content in molten steel still can be only 50-70ppm, and nitrogen-containing steel is generally obtained by feeding nitrogen wires or adding nitrogen-containing alloys such as silicon nitride manganese and the like into an LF furnace or a CAS in the converter subsequent process.
Disclosure of Invention
The invention aims to provide nitrogen-containing steel and a smelting method thereof, so as to solve the problem that the nitrogen-containing steel is too high at the smelting end point of the nitrogen-containing steel.
The aim of the invention can be achieved by the following technical scheme:
A smelting method of nitrogen-containing steel comprises the following steps:
performing KR working procedure on the molten iron raw material, adding silicon manganese nitride, stirring, then performing converter smelting with converter slag, top blowing oxygen, bottom blowing inert gas, and top blowing nitrogen after stopping oxygen blowing; the end point of converter smelting is to obtain the converter molten steel with oxygen content of 0.07-0.10wt%, carbon content less than or equal to 0.06wt%, nitrogen content of 0.008-0.0100wt%, temperature of 1620-1640 ℃, and LF refining and continuous casting to obtain the nitrogen-containing steel.
Further, the molten iron raw materials comprise molten iron and scrap steel, the molten iron accounts for 70-75wt% of the molten iron raw materials, the temperature of the molten iron is 1360-1400 ℃, and the silicon content in the molten iron is 0.4-0.5wt%; the iron content of the scrap steel is more than or equal to 93wt%.
Further, 0.4-0.6kg of silicon manganese nitride is added into each ton of molten iron raw material.
Further, the nitrogen content of the silicon manganese nitride is 25-35%, the silicon content is 40-50%, the manganese content is 8-15%, and the granularity is 0.5-5.0mm.
Further, the stirring mode is as follows: after adding the silicon manganese nitride into the molten iron, stirring and adding nitrogen by using a KR stirring head, wherein the insertion depth of the stirring head is 1.2m, the speed of the stirring head is 100-150r/min, and stirring is carried out for 15-20min.
Further, top-blowing oxygen includes: the top-blown oxygen is carried out by using an oxygen lance, the distance between the air outlet end of the oxygen lance and the liquid level of molten iron raw materials is 2.5-4.0m, the top-blown oxygen intensity is 48000-52000m 3/h, and the oxygen flow rate of the top-blown oxygen is 45-55m 3/ton of molten steel.
Further, the flow rate of the bottom blowing inert gas is 480-640m 3/h.
Further, top-blowing nitrogen gas includes: the distance between the air outlet end of the oxygen lance and the raw material molten steel is 2.5-4.0m, the flow rate of top-blown nitrogen is 48000-52000m 3/h, and the total flow rate of top-blown nitrogen is 2.5-4.0m 3/ton of molten steel; and the end point oxygen content of molten steel for smelting raw molten steel by using nitrogen blown by the top of an oxygen lance is more than or equal to 0.09 percent.
A nitrogen-containing steel is prepared by the above steps.
The invention has the beneficial effects that:
In the KR process, powdery silicon manganese nitride is added, the adding amount of each ton of molten iron is 0.5-1.0kg, and the mixture is stirred for 15-20min by a KR stirring head to increase nitrogen. The converter reduces the molten iron ratio, blows nitrogen to increase nitrogen after stopping blowing, can add 0.5-1.0kg of silicon manganese nitride per ton of molten iron, and adds 1.5-2.0kg of silicon manganese nitride per ton of steel in the LF refining process to increase nitrogen, thereby effectively reducing the adding amount of silicon manganese nitride. Compared with the prior art that the silicon manganese nitride is added into the LF furnace, the silicon manganese nitride is added into the KR process, the nitrogen content in the KR process is higher than that in the LF process by the same addition amount, namely the silicon manganese nitride is lower in consumption, the nitrogen is increased to 0.0095%, 1.0-1.5kg of silicon manganese nitride is added into the LF process in the original process, and the nitrogen is increased by the novel process KR+converter, namely only 0.5-1.0kg of silicon manganese nitride is consumed.
According to the smelting method of the nitrogen-containing steel, the molten steel temperature at the smelting end point of the converter is controlled to be 1620-1640 ℃ by controlling the molten iron ratio of the molten iron raw materials, the molten iron temperature and the total oxygen flow of top-blown oxygen.
According to the smelting method of the nitrogen-containing steel, the molten iron raw material with a lower molten iron ratio is used, so that the demanganizing effect of converter smelting can be effectively improved, adverse effects on the performance of steel types can be avoided, and the waste steel is ensured to be fully dissolved. In addition, the proportion of scrap steel in the molten iron raw material can be improved, so that the production cost is reduced.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The inert gas used in the examples and comparative examples of the present invention was argon. The converter slag used in the invention takes quicklime as a main material and light burned magnesium balls are added as auxiliary materials to obtain the converter slag, the alkalinity of the converter slag is more than 2, the addition amount of the converter slag is 30-50 kg/ton of molten steel, wherein lime at least contains 90wt% of calcium oxide, magnesium balls at least contain 60wt% of MgO, the addition amount of the magnesium balls is 1.5-1.8 t/ton of molten steel, and in the examples and comparative examples, each ton of molten steel contains 220 tons of molten steel. The scrap steel used in the invention is derived from various recycled waste steel, wherein the iron content is more than or equal to 93wt%.
The calculation formula of the molten iron ratio in the invention is as follows: molten iron ratio = molten iron mass/(molten iron mass + scrap mass) ×100%. The alkalinity referred to in the present invention is the mass ratio of calcium oxide to silicon dioxide in the converter slag, i.e. w (CaO)/w (SiO 2)
Example 1
And (3) carrying out KR desulfurization on the molten iron raw material, wherein in the KR process, the molten iron amount is 173 tons, 0.8kg of silicon manganese nitride is added into each ton of molten iron, the nitrogen is added by stirring with a KR stirring head, the speed of the stirring head is 120r/min, the insertion depth is 1.2m, and the nitrogen is added by stirring for 18 min. The molten iron amount after the KR treatment is 170 tons, the scrap steel is 60 tons, the iron content in the scrap steel is 95 weight percent, and the temperature of the molten iron is 1372 ℃; the oxygen flow of top-blown oxygen is 49m 3/ton of molten steel, the top-blown oxygen is started, the position of the oxygen outlet end of the oxygen blowing gun is 1.8m away from the liquid level of molten iron raw materials, and the top-blown oxygen flow is oxygen accounting for 90% of the total oxygen supply; then controlling the position of the oxygen outlet end of the oxygen blowing gun to be 1.6 meters away from the liquid level of the molten iron raw material, and top blowing the rest oxygen accounting for 10 percent of the total oxygen supply; lime consumption is 6900kg, converting process temperature is 1569 ℃, and flow of bottom blowing inert gas N 2 is 420m 3/h; after stopping blowing oxygen, the height of the oxygen lance is reduced to 2.8m from the liquid level of molten steel, the nitrogen blowing flow is 50000m 3/h, the nitrogen blowing flow is 680m 3, and the end temperature is 1635 ℃; and (3) obtaining 0.088wt% of end point oxygen at the end point of converter smelting, and continuously casting to obtain the nitrogen-containing steel with the molten steel nitrogen content of 0.0095 wt%.
Comparative example 1
Compared with example 1, the nitrogen is increased without the KR procedure:
After KR desulfurization is carried out on the molten iron raw material, 185 tons of molten iron is added into a converter, 45 tons of scrap steel is added into the converter, the iron content in the scrap steel is 95 weight percent, and the temperature of the molten iron is 1379 ℃; the oxygen flow of top-blown oxygen is 51m 3/ton of molten steel, the top-blown oxygen is started, the position of the oxygen outlet end of the oxygen lance is 1.8 m away from the liquid level of molten iron raw materials, and the top-blown oxygen flow accounts for 90% of the total oxygen supply; then controlling the position of the oxygen outlet end of the oxygen blowing gun to be 1.6 meters away from the liquid level of the molten iron raw material, and top blowing the rest oxygen accounting for 10 percent of the total oxygen supply; lime consumption is 7700kg, the temperature of the converting process is 1569 ℃, and the flow of bottom blowing inert gas N 2 is 420m 3/h; the end point temperature is 1645 ℃; and obtaining the nitrogen-containing steel with the molten steel nitrogen content of 0.0027wt% by obtaining the end point oxygen of 0.068wt% at the end point of converter smelting. And adding silicon manganese nitride in the LF treatment process, wherein the adding amount of each ton of steel is 1.7kg, and carrying out continuous casting to obtain the molten steel with the nitrogen content of 0.0082%.
Comparative example 2
Compared with example 1, the nitrogen is increased without the KR procedure:
After KR desulfurization is carried out on the molten iron raw material, the molten iron adding amount of a converter is 190 tons, the scrap steel is 40 tons, the iron content in the scrap steel is 95 weight percent, and the temperature of the molten iron is 1370 ℃; the oxygen flow of top-blown oxygen is 52m 3/ton of molten steel, the top-blown oxygen is started, the position of the oxygen outlet end of the oxygen lance is 1.8 m away from the liquid level of molten iron raw materials, and the top-blown oxygen flow accounts for 90% of the total oxygen supply; then controlling the position of the oxygen outlet end of the oxygen blowing gun to be 1.6 meters away from the liquid level of the molten iron raw material, and top blowing the rest oxygen accounting for 10 percent of the total oxygen supply; lime consumption is 7400kg, converting process temperature is 1569 ℃, and flow of bottom blowing inert gas N 2 is 420m 3/h; the end point temperature is 1658 ℃; and obtaining the nitrogen-containing steel with the molten steel nitrogen content of 0.0020wt% by obtaining the end point oxygen of 0.064wt% at the end point of converter smelting. And adding silicon manganese nitride in the LF treatment process, wherein the adding amount of each ton of steel is 1.8kg, and carrying out continuous casting to obtain the molten steel with the nitrogen content of 0.0089%.
As can be seen from the nitrogen content in the nitrogen-containing steels obtained in the above-mentioned example 1 and comparative examples 1 to 2 and the amount of the silicon manganese nitride used, the nitrogen-containing steel having satisfactory contents of manganese, oxygen, etc. can be obtained by the smelting method of the nitrogen-containing steel of the example 1 of the present application. The nitrogen-containing steel not obtained by smelting the nitrogen-containing steel smelting method of the application, namely the nitrogen-containing steel prepared in comparative examples 1 and 2, obviously does not meet the requirements of the nitrogen-containing steel.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The smelting method of the nitrogen-containing steel is characterized by comprising the following steps of:
performing KR working procedure on the molten iron raw material, adding silicon manganese nitride, stirring, then performing converter smelting with converter slag, top blowing oxygen, bottom blowing inert gas, and top blowing nitrogen after stopping oxygen blowing; the end point of converter smelting is to obtain the converter molten steel with oxygen content of 0.07-0.10wt%, carbon content less than or equal to 0.06wt%, nitrogen content of 0.008-0.0100wt%, temperature of 1620-1640 ℃, and LF refining and continuous casting to obtain the nitrogen-containing steel.
2. The method for smelting nitrogen-containing steel according to claim 1, wherein the molten iron raw material comprises molten iron and scrap steel, the molten iron accounts for 70-75wt% of the molten iron raw material, the temperature of the molten iron is 1360-1400 ℃, and the silicon content of the molten iron is 0.4-0.5wt%; the iron content of the scrap steel is more than or equal to 93wt%.
3. The method for producing a nitrogen-containing steel according to claim 1, wherein 0.4-0.6kg of silicon manganese nitride is added per ton of molten iron raw material.
4. The method for smelting nitrogen-containing steel according to claim 1, wherein the content of nitrogen in the silicon nitride manganese is 25-35%, the content of silicon is 40-50%, the content of manganese is 8-15%, and the grain size is 0.5-5.0mm.
5. The method for smelting nitrogen-containing steel according to claim 1, wherein the stirring mode is as follows: after adding the silicon manganese nitride into the molten iron, stirring and adding nitrogen by using a KR stirring head, wherein the insertion depth of the stirring head is 1.2m, the speed of the stirring head is 100-150r/min, and stirring is carried out for 15-20min.
6. The method for smelting nitrogen-containing steel according to claim 1, wherein the top-blowing of oxygen comprises: the top-blown oxygen is carried out by using an oxygen lance, the distance between the air outlet end of the oxygen lance and the liquid level of molten iron raw materials is 2.5-4.0m, the top-blown oxygen intensity is 48000-52000m 3/h, and the oxygen flow rate of the top-blown oxygen is 45-55m 3/ton of molten steel.
7. The method for smelting nitrogen-containing steel according to claim 1, wherein the flow rate of the bottom blowing inert gas is 480-640m 3/h.
8. The method for smelting nitrogen-containing steel according to claim 1, wherein the top-blowing of nitrogen gas comprises: the distance between the air outlet end of the oxygen lance and the raw material molten steel is 2.5-4.0m, the flow rate of top-blown nitrogen is 48000-52000m 3/h, and the total flow rate of top-blown nitrogen is 2.5-4.0m 3/ton of molten steel; and the end point oxygen content of molten steel for smelting raw molten steel by using nitrogen blown by the top of an oxygen lance is more than or equal to 0.09 percent.
9. A nitrogen-containing steel, characterized by being smelted by the smelting method of the nitrogen-containing steel according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410243064.8A CN118086619A (en) | 2024-03-04 | 2024-03-04 | Nitrogen-containing steel and smelting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410243064.8A CN118086619A (en) | 2024-03-04 | 2024-03-04 | Nitrogen-containing steel and smelting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118086619A true CN118086619A (en) | 2024-05-28 |
Family
ID=91147273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410243064.8A Pending CN118086619A (en) | 2024-03-04 | 2024-03-04 | Nitrogen-containing steel and smelting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118086619A (en) |
-
2024
- 2024-03-04 CN CN202410243064.8A patent/CN118086619A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111500815B (en) | Bottom blowing O2-CO2Dynamic control method for steelmaking process of CaO converter | |
| CN113322364B (en) | Low-cost smelting method of ultra-high phosphorus molten iron of steel for polar region | |
| JP3239197B2 (en) | Converter steelmaking method | |
| CN112708717A (en) | Method for smelting low-phosphorus molten steel by single-converter duplex method | |
| JP2000073112A (en) | Dephosphorizing method of molten iron, and method for melting low-sulfur and low-phosphorus steel | |
| CN1470653A (en) | Converter steelmaking process | |
| CN113862419A (en) | Method for controlling phosphorus content of molten steel in tapping weak deoxidation mode | |
| CN110564908A (en) | double-slag dephosphorization and steel-making method for semisteel converter | |
| CN113462853A (en) | Smelting method for efficiently removing sulfur element in ultrahigh-sulfur molten steel | |
| CN118086619A (en) | Nitrogen-containing steel and smelting method thereof | |
| CN113088617B (en) | Converter steelmaking method | |
| JP2958848B2 (en) | Hot metal dephosphorization method | |
| JP2002249814A (en) | Method for producing low phosphorus molten iron | |
| CN108796162B (en) | Rapid dephosphorization method for semisteel smelting converter and steelmaking method | |
| CN112899430A (en) | Method for improving energy utilization efficiency in converter | |
| JPH0477046B2 (en) | ||
| CN115652184B (en) | Method for smelting ultra-pure ferrite stainless steel by using slag melting agent in AOD converter | |
| CN115558735B (en) | Smelting method of pure iron | |
| CN115418434B (en) | Production method of low-phosphorus molten iron for carburetion | |
| CN115725817B (en) | Rapid desulfurization method for low-carbon low-silicon aluminum killed steel | |
| CN115537491B (en) | Converter converting method of low-temperature low-silicon molten iron | |
| CN113512621B (en) | Method for increasing nitrogen in molten steel by converter oxygen-nitrogen mixed blowing | |
| CN1025438C (en) | Smelting method of stainless steel in arc furnace with top and bottom complex blowing | |
| JP2842231B2 (en) | Pretreatment of hot metal by bottom-blown gas stirring | |
| CN113073169A (en) | Method for making steel by using dephosphorized steel slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |